typedef struct { 
unsigned int __softirq_pending; 
unsigned long idle_timestamp; 
unsigned int __nmi_count; /* arch dependent */ 
unsigned int apic_timer_irqs; /* arch dependent */ 
} ____cacheline_aligned irq_cpustat_t;

typedef struct { 
unsigned int __softirq_pending; 
} ____cacheline_aligned irq_cpustat_t;

1：local_softirq_pending()

CODE:#ifndef __ARCH_IRQ_STAT 
extern irq_cpustat_t irq_stat[]; /* defined in asm/hardirq.h */ 
#define __IRQ_STAT(cpu, member) (irq_stat[cpu].member) 
#endif 

/* arch independent irq_stat fields */ 
#define local_softirq_pending() \ 
__IRQ_STAT(smp_processor_id(), __softirq_pending)

2.#define __raise_softirq_irqoff(nr) do  
{ local_softirq_pending() |= 1UL << (nr); } while (0)